As far as I know everything you need comes with the Fluval. I bet it would be much cheaper to order one online than to buy it at a pet store, even though you have to pay for the shipping. Here, check this out: http://www.bigalsonline.com/catalog/...d1=2885;pcid2=
If you don't want to spend that much and your budget forces you to choose a HOB
filter instead, I would recommend an Aquaclear 70 or Emperor 280. Both of these are also much cheaper at Big Al's. Look around the site, I'm sure you will find something you want. 8) The Petsmart where I live will price match online prices when I bring in a printout from a website. You may want to check in to that, I have saved TONS of money on filters that way.